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J Invertebr Pathol. 2014 Oct;122:52-4. doi: 10.1016/j.jip.2014.08.009. Epub 2014 Sep 8.

Spodoptera frugiperda (J.E. Smith) with field-evolved resistance to Bt maize are susceptible to Bt pesticides.

Author information

1
Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA.
2
Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN 37996, USA. Electronic address: jurat@utk.edu.

Abstract

Field-evolved resistance to maize event TC1507 expressing the Cry1Fa toxin from Bacillus thuringiensis (Bt) was detected in populations of Spodoptera frugiperda from Puerto Rico. We tested for cross-resistance to purified Cry1A toxins and commercial Bt pesticides in susceptible (Benzon) and TC1507-resistant (456) strains of S. frugiperda. Larvae from the 456 strain exhibited cross-resistance to Cry1Ab and Cry1Ac toxins, while no differences in susceptibility to XenTari WG and DiPel ES pesticides were detected. These data support cross-resistance to toxins that share binding sites with Cry1Fa and no cross-resistance to Bt pesticides in S. frugiperda with field-evolved resistance to Bt maize.

KEYWORDS:

Bacillus thuringiensis; Bt maize; Bt pesticide; Bt resistance; Cross-resistance; Spodoptera frugiperda

PMID:
25218399
DOI:
10.1016/j.jip.2014.08.009
[Indexed for MEDLINE]

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